Sound reproducing apparatus



Oct 1936- F. FREIMANN ET AL 2,

SOUND REPRODUCING APPARATUS Filed May 22, 1935 Patented Oct. 6, 1936UNITED STATES PATENT OFFICE SOUND REPRODUCING APPARATUS ration ofIllinois Application May 22, 1935, Serial No. 22,886

11 Claims.

The present invention relates to an improvement in sound reproducingapparatus of the character employing a sound record of the disc type,and more particularly to a novel arrangement in a carrying case wherebythe record supporting platen may be removed and conveniently and ffirmlysecured in a compartment provided there- An object of the presentinvention is to providean improved carrying case for sound reproducingapparatus of the type employing sound records of the disc type.

Another object of the invention is to provide within a carrying case ofthe character described. a novel form of support for a demountablerecord supporting platen.

' A further object of the invention is to provide a novel form of platenholding means for apparatus of the character disclosed, wherein therecord holding means in addition to firmly supporting the platen willalso hold a separate baflie of the type disclosed in our oopendingapplication entitled Loud speaker mounting, filed May 22, 1935, andidentified by Serial Number 22,887.

will be in part evident to those skilled in the art to which thisinvention pertains and in part pointed out as the description thereofproceeds.

For a better understanding of the invention, reference should be had tothe accompanying drawing wherein there is shown, by way of illustrationand not of limitation, preferred embodiments thereof.

In the drawing, wherein like numerals refer to like parts- Figure 1 is aperspective view of a carrying case of the character contemplated bythis invention with a portion broken away to reveal one embodiment ofthe invention, 40 Figure 2 is an end elevation of the carrying caseillustrated in Figure 1, with a portion thereof broken away to moreclearly show the manner of securing the demounted record supportingplaten,

Figure 3 and 4 are fragmentary views similar to Figure 2, showingarrangements for supporting a record platen and a separate loud speakerbaiiie, and

Figure 5 shows a modified form of the platen 50 supporting meanscontemplated by this inventlon.

For the purpose of illustrating this invention we have, in the drawing,shown a carrying case of the type contemplated in a copending appli- 55cation filed by Frank Freimann, August 18, 1934,

entitled Carrying case and identified by Serial Number 740,448.

In the drawing, the numeral l0 designates a carrying case that isadapted to enclose a picture projecting lantern, a loud speaker and asuitable 5 thermionic amplifying means, all of which are adapted tooperate in conjunction with an electromagnetic sound reproducingapparatus. The carrying case II) has a cover II that can be securedthereover to enclose the sound reproducing 10 apparatus mountedexternally upon the top of the carrying case II). The sound reproducingapparatus, in one form, consists of a suitable motor driven means havinga vertically disposed shaft l2 upon which a record supporting platen 15I: may be mounted. Cooperating with a sound record upon the supportingplaten l3 there is an electromagnetic pick-up device H which is carriedby a supporting arm I5. The supporting arm I5 is mounted with a swivelconnection upon a pedestal It so that when the pick-up device I 4 isplaced in the sound track of the record it will generate sound frequencycurrents which can be reproduced by a suitable loud speaker. In thepresent instance such a loud speaker, designated by the numeral I1, isshown as mounted in the side of the carrying case III. The pictureprojecting apparatus, previously referred to as contained within thecarrying case 80, is mounted upon a hinged panel It at one end of thecarrying case in such a manner that when this hinged panel is swungoutwardly the'picture projecting apparatus will move into a position forthe projection of a picture upon a screen located in front thereof. I 35For convenience the carrying case it) is made as narrow as ispracticable to contain the picture projecting apparatus, the thermionicamplifying means and the loud speaker. Therefore, in order that thesound reproducing apparatus 40 may be rendered adaptable to thereproduction of programs from records having a diameter greater than thewidth of the carrying case, the record supporting platen I3 is maderemovable from its driving shaft l2. when the record supporting platenI3 is thus removed from its horizontal position upon the drivingmechanism it is carried in a narrow vertical compartment l9 at one sideof the carrying case It where the cover ll may be secured thereover.Under these conditions the supporting arm I! will be secured in a stableposition, in the manner disclosed and claimed inv the aforesaidapplication, filed by Frank Freimann. The carrying case with the entireequipment can then be. transported conveniently from one place toanother. For this purpose the cover II is provided with a handle or grip20, as shown in Figure 2 of the drawing.

As illustrated in the drawing, the sound record supporting platen l3 hasa central hub 2| with an axially extending aperture 22 through which themotor driven shaft l2 may project to center the sound record as is wellknown. In addition to this axially extending hole 22 the hub 2| isprovided, in' one embodiment of this invention, with a transverselyextending aperture 23 into which a supporting pin 24 is adapted toproject. In order to provide for a narrow compartment IQ for the removedplaten |3 we provide a notch 25 which extends downwardly from the topedge of a compartment forming partition 26. This notch 25 is made ofsuiziicient width to receive the hub 2| of the record supporting plateni3 and it is deep enough to hold the platen l3 at a point where thecover I I will close thereover. The vertically extending pin 24 is shownas projecting upwardly in the center of the notch 25 so that when thetransversely extending aperture 23 of the hub 2| is placed thereover thehub 2| of the record supporting platen l3 will be centered within thenotch 25 of the partition 26. When the pin 24 thus located in the notch25 is inclined at a 'slight angle, as illustrated in Figure 2 of thedrawing, it will exert a wedging action upon the hub 2| and cause theflanged rim of the record supporting platen I3 to be pressed firmlyagainst the side of the compartment forming partition 26. This willfirmly secure the platen l3 upon the partition 26 and prevent a rattlingthereof during transportation of the apparatus from one place toanother.

If the carrying case is equipped with a removable loud speaker I1 and aseparate baffle forming member, as contemplated in an application filedby us concurrently herewith, the pin 24 may be inclined at an oppositeangle, as shown in Figure 3 of the drawing. This will cause the recordsupporting platen l3 to be urged away from the compartment formingpartition 26. When the pin 24 is inclined in this manner and a separatebafile forming member 21 is placed within the compartment l9, asillustrated, both the platen and the baiiie forming member 21 will besnugly held against vibration within the compartment IQ of the carryingcase.

In Figure 4 of the drawing, there is showna variation of the last abovearrangement, in which a pin, designated by the numeral 28, is disposedwithin the compartment l9 and out of alignment with the notch 25, sothat it will engage the aperture 23 in the hub 2| when the separatebaffle forming member 21 is disposed between the baflle formingpartition 28 and the record supporting platen l3.

In each of these last two arrangements the disposition and theinclination of the pins 24 and 28 will be such that a wedging actionwill be produced in one direction or another to firmly hold the platenl3 and the separate baffle forming member 21 against one of the sidewalls of the compartment l9.

In Figure 5 of the drawing, there is illustrated an embodiment of theinvention, wherein instead of a pin 24 or a pin 28 the notch 25 isprovided with a member 29 having upwardly extending spaced portions 30which are adapted to engage a groove 3| that extends completely aroundthe outside of a hub 32 upon the record supporting platen l3. In thisembodiment it is contemplated that the upwardly projecting portions 3!!of the member 29 may be inclined at one angle or another to provide fora wedging action similar to that previously described in connection withpins 24 and 28.

While we have, for the sake of clearness and in order to disclose ourinvention so that the same can be readily understood, described andillustrated specific devices and arrangements, we desire to have itunderstood that this invention is not limited to the specific meansdisclosed, but may be embodied in other ways that will suggestthemselves to persons skilled in the art. It is believed that thisinvention is new and it is desired to claim it so that all such changesas come within the scope of the appended claims are to be considered aspart of this invention' Having thus described our invention, what weclaim and desire to secure by Letters Patent 1. In a carrying case forsound reproducing apparatus of the type employing sound records of thedisc type, the combination of a'detachable record supporting platenhaving a central hub for connection with a driving mechanism, apartition within said carrying case forming a compartment into whichsaid record supporting platen may be disposed when detached from saiddriving mechanism, and means located upon a wall of said compartmentengaging the hub upon said platen for securing said platen upon saidwall of the compartment.

2. In a carrying case for sound reproducing apparatus of the typeemployingsound records of the disc type, the combination of a detachablerecord supporting platen having a central hub through which a drivingshaft may pass, a vertically disposed partition within said carryingcase forming a compartment into which said record supporting platen maybe disposed when detached from said vertical shaft, and means locatedupon a wall of said compartment engaging the hub upon said platen forsecuring said platen against said wall of the compartment.

3. In a carrying case for sound reproducing apparatus of the typeemploying sound records of the disc type, the combination of adetachable record supporting platen having a central hub by which it maybe attached to a driving shaft, a partition within said carrying caseforming a compartment into which said record supporting platen may bedisposed when detached from said shaft, and means carried by saidpartition engaging the hub upon said platen for se-- curing said platenagainst said partition.

4. In a carrying case for sound reproducing apparatus of the characteremploying records 5. In a carrying case for sound reproducing apparatusof the character employing records of the disc type, the combination ofa removable record supporting platen, a compartment in said carryingcase for said record supporting platen when said platen is removed fromits driving means, said record supporting platen having a central hubwith a transversely extending hole therein, and an upwardly extendingpin located upon a wall of said compartment adapted to project into thetransversely extending hole in said hub and secure said platen againstsaid wall.

6. The combination set forth in claim wherein the supporting pin isinclined at a slight angle so as to draw the record platen tightlyagainst the surface of said wall when the hub is forced thereupon.

'7. In a ca ryin case for sound reproducing apparatus of the characteremploying records of. of the disc type, the combination of a removablerecord supporting platen, a compartment in said carrying case for saidrecord supporting platen .when said platen is removed from its drivingmeans, said record supporting platen having a central hub with a supportengaging groove extending therearound, and a support upon a wall of saidcompartment adapted to engage said groove and secure said platen againstsaid wall.

8. The combination set forth in claim '7 wherein the groove engagingsupport is inclined at a slight angle so as to hold the record platenagainst a wall of said compartment when the hub is forced thereupon.

9. In apparatus of the character described, the combination of a soundrecord supporting platen having a central shaft engaging hub, said hubhaving a special support engaging configuration, a compartment formingpartition having a notch extending into its outer edge into which thehub of said platen may be disposed when the platen is placed edgewise insaid compartment, and

means located in said notch adapted to cooperate with the supportengaging configuration of said hub to secure said platen firmly andsecurely against said partition.

10. In apparatus of the character described, the combination of a soundrecord supporting platen having a driving shaft engaging hub, said hubhaving a support engaging groove therearound a vertically disposedcompartment forming partition having a notch extending downwardlyfrom-its top edge into which the hub of said platen may be disposed whenthe platen is *placed edgewise in said compartment,.and a pair of spacedmembers located in said notch adapted to engage the groove around saidhub and secure said platen firmly and securely within said compartment.

11. In apparatus of the character described, the combination of a soundrecord supporting platen having a driving shaft engaging hub, said hubhaving a support engaging opening, a vertically disposed compartmentforming partition having a notch. extending downwardly from its top edgeinto which the hub of said platen may be disposed when the platen isplaced edgewisein said compartment, and a projecting pin located in saidnotch adapted to cooperate with the opening in said hub to secure saidplaten firmly and securely within said compartment.

FRANK FREIMANN. JOHN L. FRIESNER.

